# -*- coding: utf-8 -*-

# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
from scrapy.http.headers import Headers
from scrapy01 import user_agent


class Scrapy01SpiderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, dict or Item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request, dict
        # or Item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class Scrapy01DownloaderMiddleware(object):
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        request.headers = Headers(
            {
                'User-agent': user_agent.get_user_agent_pc(),
                'Cookie': 'acw_tc=2760821715717274169264223e269ca4624ee0d748f28fde265f2b63d9b1ad; uuid_tt_dd=10_20345766140-1571727416930-195874; dc_session_id=10_1571727416930.846717; TY_SESSION_ID=fe49dbeb-2e6a-4f7f-81b6-dae93def3803; Hm_lvt_6bcd52f51e9b3dce32bec4a3997715ac=1571727326; Hm_ct_6bcd52f51e9b3dce32bec4a3997715ac=6525*1*10_20345766140-1571727416930-195874; ADHOC_MEMBERSHIP_CLIENT_ID1.0=e4634282-86d9-4468-c40e-628948f2bfc6; announcement=%257B%2522announcementUrl%2522%253A%2522https%253A%252F%252Fblogdev.blog.csdn.net%252Farticle%252Fdetails%252F102605809%2522%252C%2522announcementCount%2522%253A1%252C%2522announcementExpire%2522%253A282422182%257D; cname14587=1; acw_sc__v3=5daea8c4bf78f8634c354f0dbd69bd44ce50ca3a; acw_sc__v2=5daea8b2dbeecce621ac3bd88bf5db9170e03584; Hm_lpvt_6bcd52f51e9b3dce32bec4a3997715ac=1571727477; dc_tos=pzrkok',
            }
        )
        print('#'*500)
        print('要去settings里面去配置DOWNLOADER_MIDDLEWARES')
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)
